Assertion : Inspiration occurs due to muscular relaxation.
Reason : During inspiration, the diaphragm and external intercostal muscle contract simultaneously.
A. If both assertion and reason are true and the reason is a correct explanation of the assertion
B. If both assertion and reason are true but reason is not. a correct explanation of the assertion
C. If the assertionis true but reasonis false
D. If both the assertionand reasonare false.